S= 3/2 Antiferromagnetic Spin Chain with Bond Alternation

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概要

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• The successive phase transitions of the Heisenberg spin chain with bond alternation, H = ∑i=1L-1[1-(-1)i δ]S i ·S i+1, for the spin S=3/2 case under the open boundary condition are investigated by the density-matrix renormalization-group method proposed by White. Besides the Heisenberg point, we find that another gapless point exists at δc = 0.42 ±0.02.This result qualitatively supports the field-theoretical prediction by Affleck and Haldane.However, our estimation of δc deviates from the field-theoretical prediction, δc = 2/3. We also find a fourfold degeneracy of the ground state in the region 0 <δ< δc in the thermodynamic limit.Our results show that the degeneracy is described by the edge excitations, which is essentially similar to the one in the S=1 case.We calculate the string correlation function and find that its behavior is consistent with the valence-bond-solid (VBS) picture.

• Physical Society of Japanの論文
• 1996-01-15

著者

• Yajima Makoto

  University of Tokyo, Roppongi, Minato-ku, Tokyo 106

• Takahashi Minoru

  University of Tokyo, Roppongi, Minato-ku, Tokyo 106

関連論文

• S= 3/2 Antiferromagnetic Spin Chain with Bond Alternation

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